package com.baomidou.springwind.utils;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringBeanUtil implements ApplicationContextAware {

	/** Spring应用上下文环境 */    
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringBeanUtil.applicationContext = applicationContext;
    }


    /**   
     * @return ApplicationContext   
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**   
     * 获取对象      
     * @param name   
     * @return Object 一个以所给名字注册的bean的实例   
     * @throws BeansException
     */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }

    /**   
     * 获取类型为requiredType的对象   
     * 如果bean不能被类型转换，相应的异常将会被抛出（BeanNotOfRequiredTypeException）   
     * @param name       bean注册名   
     * @param requiredType 返回对象类型   
     * @return Object 返回requiredType类型对象   
     * @throws BeansException
     */
    public static Object getBean(String name, Class<?> requiredType) throws BeansException {
        return applicationContext.getBean(name, requiredType);
    }

    /**
     * 获取class对应的bean
     * @param tClass
     * @return
     */
    public static <T> T getBean(Class<T> tClass) {
        return applicationContext.getBean(tClass);
    }

    /**   
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true    
     * @param name   
     * @return boolean   
     */
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    /**   
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。   
     * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）      
     * @param name   
     * @return boolean   
     * @throws NoSuchBeanDefinitionException
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.isSingleton(name);
    }

    /**   
     * @param name   
     * @return Class 注册对象的类型   
     * @throws NoSuchBeanDefinitionException
     */
    public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getType(name);
    }

    /**   
     * 如果给定的bean名字在bean定义中有别名，则返回这些别名      
     * @param name   
     * @return   
     * @throws NoSuchBeanDefinitionException
     */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getAliases(name);
    }

}
